MESON Chess Problem Database

Problem Display
PID: 58857 (B7/n1pQbNn1/2rP2K1/3k4/bP4R1/3N4/3R3B/1q6 w - - 0 1)

Ellerman, Arnoldo

3rd Prize, Brisbane Courier, 1921

B7/n1pQbNn1/2rP2K1/3k4/bP4R1/3N4/3R3B/1q6

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sb2#
    • 1...Qxd3+
      • 2.Rxd3#
    • 1...Qa1
      • 2.Sb2#
    • 1...Qc1
      • 2.Sxc1#
    • 1...Qe1
      • 2.Sxe1#
    • 1...Qg1
      • 2.Sf2#
    • 1...Qh1
      • 2.Sc1#
      • 2.Se1#
      • 2.Sb2#
      • 2.Sf2#
      • 2.Sc5#
      • 2.Sde5#
    • 1...Qb2
      • 2.Sxb2#
    • 1...Bf6
      • 2.dxc7#
    • 1...Sb5
      • 2.Bxc6#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sh5
      • 2.Qf5#
    • 1...Se6
      • 2.dxe7#
    • 1...Se8
      • 2.Qf5#
  • Tries
    • 1.Bxc6+?
      • 1...Sxc6
        • 2.dxe7#
      • 1...Bxc6!
    • 1.Qxe7?
      • threat
        • 2.Qe4#
        • 2.Qe5#
      • 1...Qxd3+
        • 2.Rxd3#
        • 2.Qe4#
      • 1...Qxb4
        • 2.Qe5#
      • 1...cxd6
        • 2.Qxd6#
        • 2.Qe4#
      • 1...Qa1
        • 2.Sb2#
        • 2.Qe4#
      • 1...Qe1
        • 2.Sxe1#
      • 1...Qh1
        • 2.Sc1#
        • 2.Se1#
        • 2.Sb2#
        • 2.Sf2#
        • 2.Sc5#
        • 2.Sde5#
        • 2.Qe5#
      • 1...Qb2
        • 2.Sxb2#
        • 2.Qe4#
      • 1...Se6!
  • Keys
    • 1.Bg1!
      • threat
        • 2.Rd4#
      • 1...Qxd3+
        • 2.Rxd3#
      • 1...Qxg1
        • 2.Sf2#
      • 1...Qxb4
        • 2.Sxb4#
      • 1...Qa1
        • 2.Sb2#
      • 1...Qb2
        • 2.Sxb2#
      • 1...Bf6
        • 2.dxc7#
      • 1...Sb5
        • 2.Bxc6#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Se6
        • 2.dxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_PINS(C)::R(A)+S(C)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::R(A),XQ(a)
    • Q(a);N_PINS(C)::R(A)+S(C),XQ(a)
    • Q(a);N_PINS(C),P_PINR(E)::R(A)+S(C)
    • B(g);N_PINP(F)::QAR(H)+P(F),XP(f)
    • S(e);N_GUARD,S_CUTB(b)::B(J),XR(d)
    • S(h);N_GUARD,N_PINS(C)::QAR2(H),XS(h)
    • S(h);N_GUARD::QAR2(H)
    • S(h);N_PINP(F)::QAR(H)+P(F),XB(g)
  • Tries
    • Try
      • B(J);CHECK,N_SPINP(F),XR(d)
      • Vars
        • S(e);XB(J)::QAR(H)+P(F),XB(g)
      • Refutation
        • B(b);XB(J)
    • Try
      • Q(H);XB(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_PINS(C),XP(D)::QAR1(H)
        • Q(a);N_PINS(C)::R(A)+S(C),XQ(a)
      • Refutation
        • S(h);N_PINP(F)
  • Actual
    • B(B);
    • Threat
      • R1(E)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::R(A),XQ(a)
      • Q(a);N_PINS(C),P_PINR(E),XB(B)::R(A)+S(C)
      • Q(a);N_PINS(C),XP(D)::R(A)+S(C),DCHECK,XQ(a)
      • Q(a);N_PINS(C)::R(A)+S(C)
      • Q(a);N_PINS(C)::R(A)+S(C),XQ(a)
      • B(g);N_PINP(F)::QAR(H)+P(F),XP(f)
      • S(e);N_GUARD,S_CUTB(b)::B(J),XR(d)
      • S(h);N_GUARD,N_PINS(C)::QAR2(H),XS(h)
      • S(h);N_PINP(F)::QAR(H)+P(F),XB(g)
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